linux-kernel - Re: [PATCH v2] powerpc/power: Expose pfn_is

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Date:   Tue, 28 May 2019 17:48:58 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/power: Expose pfn_is_nosave prototype

On Tuesday, May 28, 2019 3:16:30 AM CEST Michael Ellerman wrote:
> "Rafael J. Wysocki" <rjw@...ysocki.net> writes:
> > On Friday, May 24, 2019 12:44:18 PM CEST Mathieu Malaterre wrote:
> >> The declaration for pfn_is_nosave is only available in
> >> kernel/power/power.h. Since this function can be override in arch,
> >> expose it globally. Having a prototype will make sure to avoid warning
> >> (sometime treated as error with W=1) such as:
> >> 
> >>   arch/powerpc/kernel/suspend.c:18:5: error: no previous prototype for 'pfn_is_nosave' [-Werror=missing-prototypes]
> >> 
> >> This moves the declaration into a globally visible header file and add
> >> missing include to avoid a warning on powerpc. Also remove the
> >> duplicated prototypes since not required anymore.
> >> 
> >> Cc: Christophe Leroy <christophe.leroy@....fr>
> >> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> >> ---
> >> v2: As suggestion by christophe remove duplicates prototypes
> >> 
> >>  arch/powerpc/kernel/suspend.c | 1 +
> >>  arch/s390/kernel/entry.h      | 1 -
> >>  include/linux/suspend.h       | 1 +
> >>  kernel/power/power.h          | 2 --
> >>  4 files changed, 2 insertions(+), 3 deletions(-)
> >> 
> >> diff --git a/kernel/power/power.h b/kernel/power/power.h
> >> index 9e58bdc8a562..44bee462ff57 100644
> >> --- a/kernel/power/power.h
> >> +++ b/kernel/power/power.h
> >> @@ -75,8 +75,6 @@ static inline void hibernate_reserved_size_init(void) {}
> >>  static inline void hibernate_image_size_init(void) {}
> >>  #endif /* !CONFIG_HIBERNATION */
> >>  
> >> -extern int pfn_is_nosave(unsigned long);
> >> -
> >>  #define power_attr(_name) \
> >>  static struct kobj_attribute _name##_attr = {	\
> >>  	.attr	= {				\
> >> 
> >
> > With an ACK from the powerpc maintainers, I could apply this one.
> 
> Sent.

Thanks!